1 definition by F, Frank Giuffrida

An acronym for Uncircumcised NiggaDick. It is characterized by a huge fucking black dick that still has an intact foreskin. It is allegedly much more potent than a regular Niggadick, and NATO officially considers it a WMD.
Frank: Those two guys with the spears over there are packing UNDs...
Franks: Holy fucking spicgook!!! Will our bologna masks protect us?
Frank: Possibly, but I think we will be OK if we smash each others' balls with your industrial strength meat tenderizer...By the way, am I a racist for my fear of UNDs?
Franks: Nah, it's cool...you're friends with a black guy.
by F, Frank Giuffrida October 18, 2008
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